Sulphur

For about 15 years I put up wood duck nesting boxes .I was into it. I was into banding them. I was a wood duck freak. Anyway, I always cleaned the bedding every year and added sulphur to the box for mite control. Now I'm into this chicken thing & was wondering how much sulphur to put into the coop . I have a 8' x 10' coop. I know how much to put in the nesting box. Any suggestions would be appreciated.